late 14c., ethimolegia "facts of the origin and development of a word," from Old French etimologie, ethimologie (14c., Modern French étymologie), from Latin etymologia, from Greek etymologia "analysis of a word to find its true origin," properly "study of the true sense (of a word)," with -logia "study of, a speaking of" (see -logy) + etymon "true sense," neuter of etymos "true, real, actual," related to eteos "true," which perhaps is cognate with Sanskrit satyah, Gothic sunjis, Old English soð "true."

Latinized by Cicero as veriloquium. In classical times, with reference to meanings; later, to histories. Classical etymologists, Christian and pagan, based their explanations on allegory and guesswork, lacking historical records as well as the scientific method to analyze them, and the discipline fell into disrepute that lasted a millennium. Flaubert ["Dictionary of Received Ideas"] wrote that the general view was that etymology was "the easiest thing in the world with the help of Latin and a little ingenuity."

As a modern branch of linguistic science treating of the origin and evolution of words, from 1640s. As "account of the particular history of a word" from mid-15c. Related: Etymological; etymologically.

word-forming element, in modern use meaning "good, well," from Greek eus "good," eu "well" (adv.), also "luckily, happily" (opposed to kakos), as a noun, "the right, the good cause," from PIE *(e)su- "good" (source also of Sanskrit su- "good," Avestan hu- "good"), originally a suffixed form of root *es- "to be." In compounds the Greek word had more a sense of "greatness, abundance, prosperity," and was opposed to dys-.

"sacrament of the Lord's Supper, the Communion," mid-14c., from Old French eucariste, from Late Latin eucharistia, from Greek eukharistia "thanksgiving, gratitude," later "the Lord's Supper," from eukharistos "grateful," from eu "well" (see eu-) + stem of kharizesthai "show favor," from kharis "favor, grace," from PIE root *gher- (2) "to like, want." Eukharisteo is the usual verb for "to thank, to be thankful" in the Septuagint and Greek New Testament. Related: Eucharistic.

1650s, "of or pertaining to Euclid" (Greek Eukleides), c. 300 B.C.E. geometer of Alexandria. Now often used in contrast to alternative models based on rejection of some of his axioms. His name in Greek means "renowned, glorious," from eu "well" (see eu-) + kleos "fame" (see Clio).

1846, "the method of regarding myths as glorified accounts of actual events or persons," with -ism + name of Euhemerus, Greek philosopher of Sicily (4c. B.C.E.), who wrote "Iera Anagraphe," in which he maintained the Greek deities actually were historical mortals. His name is literally "good day," from eu "well, good" (see eu-) + hemera "day" (see ephemera). Related: Euhemerist; euhemeristic.

"castrated man," late 14c., from Middle French eunuque and directly from Latin eunuchus, from Greek eunoukhos "castrated man," originally "guard of the bedchamber or harem," from euno-, comb. form of eune "bed," a word of unknown origin, + -okhos, from stem of ekhein "to have, hold" (from PIE root *segh- "to hold").

Eunuches is he þat is i-gilded, and suche were somtyme i-made wardeynes of ladyes in Egipt. [John of Trevisa, translation of Higdon's "Polychronicon," 1387]

Harem attendants in Oriental courts and under the Roman emperors were charged with important affairs of state. The Greek and Latin forms of the word were used in the sense "castrated man" in the Bible but also to translate Hebrew saris, which sometimes meant merely "palace official," in Septuagint and Vulgate, probably without an intended comment on the qualities of bureaucrats. Related: Eunuchal; eunuchry; eunuchize.

1650s, from Greek euphemismos "use of a favorable word in place of an inauspicious one, superstitious avoidance of words of ill-omen during religious ceremonies," also of substitutions such as Eumenides for the Furies. This is from euphemizein "speak with fair words, use words of good omen," from eu- "good, well" (see eu-) + pheme "speech, voice, utterance, a speaking," from phanai "speak" (from PIE root *bha- (2) "to speak, tell, say").

All the ancients, but most of all the Athenians, were careful not to use ill-omened words; so they called the prison 'the chamber,' and the executioner 'the public man,' and the Furies (Erinyes) they called 'Eumenides' ('the kindly ones') or 'the Venerable Goddesses.' " [Helladius of Antinoopolis, 4 c. C.E., quoted by Photius]
Thus, in our dialect, a vicious man is a man of pleasure, a sharper is one that plays the whole game, a lady is said to have an affair, a gentleman to be a gallant, a rogue in business to be one that knows the world. By this means, we have no such things as sots, debauchees, whores, rogues, or the like, in the beau monde, who may enjoy their vices without incurring disagreeable appellations. [George Berkeley, "Alciphron or the Minute Philosopher," 1732]

See also Euxine, and compare Greek Greek aristeros "the better one," a euphemism for "the left (hand)." In English, a rhetorical term at first; broader sense of "choosing a less distasteful word or phrase than the one meant" is first attested 1793. Related: Euphemistic; euphemistically.

1727, a physician's term for "condition of feeling healthy and comfortable (especially when sick)," medical Latin, from Greek euphoria "power of enduring easily," from euphoros, literally "bearing well," from eu "well" (see eu-) + pherein "to carry," from PIE root *bher- (1) "to carry." Non-technical use, now the main one, dates to 1882 and perhaps is a reintroduction. Earlier the word meant "effective operation of a medicine on a patient" (1680s).

"characterized by euphoria," 1885, originally with reference to cocaine, from euphoria + -ic. The noun meaning "a drug which causes euphoria" also is from 1885. Euphoriant is from 1946 as a noun, 1947 as an adjective.

name of one of the three Graces in Greek mythology, via Latin, from Greek Euphrosyne, literally "mirth, merriment," from euphron "cheerful, merry, of a good mind," from eu "well, good" (see eu-) + phren (genitive phrenos) "heart, mind" (see phreno-).

chief character in two popular books by English writer John Lyly (1553-1606), from Greek euphyes "well-endowed by nature." The affected and ornate style of writing and speech popularized by the works was fashionable late 16c.-early 17c.; hence euphuism (1590s); euphuistic; euphuist.

1884 of the region of the Atlantic beside both continents; ; see Euro- + African Transferred or re-coined to describe the "colored" population of South Africa (1920s) and political situations involving both continents (1909).

c. 1600, from Greek heureka "I have found (it)," first person singular perfect active indicative of heuriskein "to find" (see heuristic). Supposedly shouted by Archimedes (c. 287-212 B.C.E.) when he solved a problem that had been set to him: determining whether goldsmiths had adulterated the metal in the crown of Hiero II, king of Syracuse.

from Latin Europa "Europe," from Greek Europe, which is of uncertain origin; as a geographic name first recorded in the Homeric hymn to Apollo (522 B.C.E. or earlier):

"Telphusa, here I am minded to make a glorious temple, an oracle for men, and hither they will always bring perfect hecatombs, both those who live in rich Peloponnesus and those of Europe and all the wave-washed isles, coming to seek oracles."

muse of music, from Greek Euterpe, literally "well-pleasing," from eu "well" (see eu-) + terpein "to delight, please" (see Terpsichore). "A divinity of joy and pleasure, inventress of the double flute, favoring rather the wild and simple melodies of primitive peoples than the more finished art of music, and associated more with Bacchus than with Apollo" [Century Dictionary]. Related: Euterpean.